JP3572470B2 - Bellows mounting structure - Google Patents

Bellows mounting structure Download PDF

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Publication number
JP3572470B2
JP3572470B2 JP510296A JP510296A JP3572470B2 JP 3572470 B2 JP3572470 B2 JP 3572470B2 JP 510296 A JP510296 A JP 510296A JP 510296 A JP510296 A JP 510296A JP 3572470 B2 JP3572470 B2 JP 3572470B2
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Japan
Prior art keywords
bellows
sealing
fixed ring
housing
projection
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JP510296A
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Japanese (ja)
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JPH09196187A (en
Inventor
壮一 岩佐
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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Priority to JP510296A priority Critical patent/JP3572470B2/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J3/00Diaphragms; Bellows; Bellows pistons
    • F16J3/04Bellows
    • F16J3/041Non-metallic bellows
    • F16J3/042Fastening details

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、筒形をなすハウジングに軸体の突出のために設けた開口を、該軸体の運動を許容しつつ気密に封止すべく用いられるベローズの取り付け構造に関する。
【0002】
【従来の技術】
例えば、車体の左右方向に延設されたラックハウジングに軸長方向への摺動自在に支承されたラック軸を備え、ラックハウジングの両側へのラック軸の突出端を左右の操向車輪に連結してなり、軸長方向へのラック軸の摺動により舵取りを行わせる構成としたラックピニオン式の舵取り装置等、筒形をなすハウジングの内部に軸長方向の移動を含めて所定の運動をなす軸体を備え、該軸体の一部を前記ハウジングの一端又は両端の開口から外部に突出させ、この突出端の運動を利用して所定の仕事を行わせる構成とした装置が、多くの産業分野において用いられている。
【0003】
この種の装置においては、ハウジングの端部に軸体の突出のために設けた開口を、該軸体の前述した運動を許容しつつ気密に封止して、水、塵芥等の異物がハウジング内部に侵入することを防止する封止手段が必要であり、この種の封止手段として、従来からベローズが用いられている。
【0004】
公知の如くベローズは、軸を含む断面内にて波形をなす周壁を有し、これらの波形の変形により軸長方向への伸縮を可能とした蛇腹状の本体筒と、該本体筒の両側に連設された対象物への固定のための環状部分(固定環)とを備える弾性材製の筒体であり、前述した封止手段として用いる場合には、ハウジングの開口縁部の外面と、該開口から突出する軸体の一部とに両側の固定環を夫々外嵌固定し、ハウジングと軸体との間に架け渡される態様に取り付けられる。この取り付けにより、前記開口が本体筒により覆われて封止が実現されると共に、該本体筒の伸縮により、前記軸体の運動(主として軸長方向の移動)を許容することができる。
【0005】
以上の如きベローズの取り付けに際しては、前記固定環の嵌着が確実に行われて、嵌着部に高いシール性を確保する必要がある。特に、前述したラックピニオン式の舵取り装置において、ラックハウジングとラック軸との間の封止手段として使用する場合、ベローズの取り付け位置が、車両の走行中に車輪により跳ね上げられる泥水、砂塵等の異物に定常的に曝される上、水中に没する場合もあることから、固定環の嵌合部におけるシール性を高めることが重要である。
【0006】
また一方、ラックハウジングとラック軸との間の封止手段としての用途においては、車輪により跳ね上げられる飛石の衝突等、車両走行中における外力の作用による破損を防ぎ、エンジンルーム内に発生する熱に対して十分な耐性を有し、更に軽量化を図ることが要求されており、これらの要求に応えるべく近年においては、ポリオレフィン系エラストマ等の樹脂製のベローズが広く用いられるようになっている。ところが、樹脂製のベローズは、一般的なゴム製のベローズに比して弾性に劣るため、固定環の嵌着部におけるシール性の確保が一層重要な課題となる。
【0007】
従来においては、取り付け対象部位の外径に対して十分な締め代を確保して固定環の内径を設定し、該固定環を引き延ばした状態にて対象部位に嵌め合わせる一方、この嵌合部の外側を締め付けバンドにより締め付け、固定環の内面を対象部位の外面に強く押し付けて両面の密着性を高めることにより、シール性の向上を図ると共に、嵌着位置の位置ずれを防ぐようにした取り付け構造が一般的に採用されている。
【0008】
ところが、このような取り付け構造を採用した場合、特に、弾性の不足により十分な締め代を確保し難い樹脂製のベローズにおいては、固定環の嵌合部におけるシール性は十分でなく、本体筒の伸縮に伴う内外気の給排が前記嵌合部を経て生じ、この給排気と共にハウジング内に侵入する異物を十分に防ぎ得ないという問題がある。
【0009】
特開平6-313480号公報等には、ベローズの固定環の嵌合部におけるシール性を高める提案がなされている。図は、特開平6-313480号公報に開示されたベローズの固定環周辺の拡大図であり、図は、その取り付け手順の説明図である。このベローズ3は、図に示す如く、周壁の1つの山形のみが示された蛇腹状の本体筒3aと、該本体筒3aの一側に連設された固定環3bとを備え、該固定環3bの内面に環状突起3cを周設し、同じく外面に、前記環状突起3cと整合するように環状の凹溝3dを周設した構成となっている。
【0010】
このような固定環3bを備えるベローズ3は、取り付け対象となるハウジングHの開口縁部に固定環3bを嵌め合わせたとき、図(a)に示す如く、固定環3bの内面の環状突起3cがハウジングHの嵌合面により押し上げられて、外面の対応する部位が、該部位に形成された凹溝3dを広げた状態にて盛り上がる。而して、この状態にある固定環3bの外側を締め付けバンド4により締め付けて得られる固定状態においては、図(b)に示す如く、凹溝3dの両側が局所的に押圧されて、内面の対応する部位に形成された環状突起3cが、前記開口縁部の外面との間にて押し潰され、この間に密な圧着状態が生じる結果、全周に亘って良好なシール性を確保し得るとされている。
【0011】
【発明が解決しようとする課題】
ところが、以上の如き取り付け構造においては、図(b)に示す如く装着される締め付けバンド4が、凹溝3dの両側の盛り上がり部により平坦な内面の一部を局所的に支えられた不安定な装着状態となり易く、この場合、軸長方向の支え力が不足し、軸長方向の位置ずれの防止という他方の目的が果たせなくなる不都合があった。
【0012】
固定環3bの外面の凹溝3dは、内面における環状突起3cの押し潰しに伴う外側の盛り上がりを吸収して、前述した不都合を回避すべく設けてあるが、該凹溝3dの断面サイズが環状突起3cの断面サイズに比して過大である場合には、環状突起3cの押し潰しが不足して所望のシール性能が得られず、逆に過小である場合には、前記盛り上がりの吸収が不十分となり、締め付けバンド4の装着状態が不安定となって、軸長方向の位置ずれが生じ易くなる。
【0013】
即ち、特開平6−313480号公報に開示されたベローズの取り付け構造において、所望の目的を達成するためには、環状突起3c及び凹溝3dに高い形状精度を確保する必要があるが、前記公報中にも開示され、この種のベローズの製造に一般的に利用されているブロー成形により満足すべき形状精度は得難く、前述した不都合を解消し得ないのが実状である。
【0014】
本発明は斯かる事情に鑑みてなされたものであり、筒形をなすハウジングに軸体の突出のために設けた開口を封止すべく用いられるベローズを、高い封止性能を確保しつつ、前記軸体の移動に伴う軸長方向の位置ずれなく取り付け得る取り付け構造を提供することを目的とする。
【0015】
【課題を解決するための手段】
本発明に係るベローズの取り付け構造は、軸長方向への伸縮が可能な蛇腹状の本体筒の両側に固定環を連設してなるベローズを用い、筒形をなすハウジングの端部開口の縁部外面と、該開口から突出する軸体の一部とに前記固定環を夫々外嵌し、締め付けバンドにより外側から締め付けて、前記ハウジングに対する前記軸体の運動を前記本体筒の伸縮により許容しつつ、前記開口を気密に封止するベローズの取り付け構造において、前記固定環の内面に環状をなして周設された一又は複数の封止突起と、前記締め付け時に前記固定環の外面を前記封止突起の対応部位を避けて押圧すべく、前記締め付けバンドの内面に突設された押圧突起とを具備することを特徴とする。
【0016】
本発明においては、ベローズの固定環を嵌着対象となるハウジングの開口縁部に外嵌せしめたとき、固定環の内面に周設された封止突起が開口縁部の外面に局所的に当接した状態となり、固定環の外側に締め付けバンドを締め付けたとき、前記開口縁部の外面との間にて封止突起が押し潰されて全周に亘る封止状態が確保され、また、締め付けバンドの内面に突設された押圧突起が固定環を外側から押圧し、封止突起の両側が開口縁部の外面に押し付けられて軸長方向の位置ずれを防ぐ
【0017】
【発明の実施の形態】
以下本発明をその実施の形態を示す図面に基づいて詳述する。図1は、本発明の実施に用いるベローズ及び締め付けバンドの要部拡大断面図である。本発明の実施に用いるベローズ1は、周壁の1つの山形のみが示された蛇腹状の本体筒1aと、該本体筒1aの一側に連設された固定環1bとを備えてなり、該固定環1bの内面には、半円形の断面形状を有する3本の封止突起1c,1c,1cが、軸長方向に略等間隔だけ離隔して環状をなして周設されている。
【0018】
前記ベローズ1は、樹脂、ゴム等の弾性材料からなり、前記固定環1bは、外力の印加により適宜の範囲内にて拡径させることができ、この状態にて対象物に嵌め合わせて拡径を解除することにより、ベローズ1の一側を対象物に固定すべく用いられる。
【0019】
以上の如きベローズ1と共に本発明の実施に用いる締め付けバンド2は、ばね鋼等の弾性に富む材料からなる薄板を、前記固定環1bに対応する長さを有する環状に成形してなる金属環であり、同様の用途に従来から用いられているものと同様、外径側からの適宜の操作により、前記固定環1bの外径よりも十分に小さい内径を有する締め付け状態と、固定環1bの外径よりも大きい内径を有する嵌め込み状態とに拘束し得るようになしてある。
【0020】
図示の如く締め付けバンド2の内面には、押圧突起2aが内向きに突設されている。図示の押圧突起2aは、締め付けバンド2の周壁を内向きに窪ませ、固定環1bの内面における前記封止突起1c,1c,1cと略等しい間隔を隔てて周設された2本の環状突起として構成されている。
【0021】
図2は、以上の如き締め付けバンド2を用いて行われるベローズ1の取り付け手順の説明図である。図中Hは、取り付け対象となるハウジングであり、前記ベローズ1の取り付けは、従来と同様、前記ハウジングHの一側に、図示しない軸体の突出のために設けた開口縁部の外周に固定環1bを嵌め合わせ、該固定環1bの外側を前記締め付けバンド2により締め付けてなされる。
【0022】
図2(a)は、ハウジングHの開口縁部外周に固定環1bを嵌め合わせた状態を示している。固定環1bの内面には、前記封止突起1c,1c,1cが周設されており、図2(a)に示す固定環1bの嵌合状態においては、前記封止突起1c,1c,1cの夫々が前記開口縁部の外周面に局所的に当接した状態にある。
【0023】
締め付けバンド2は、前述した嵌め込み状態に拘束して、固定環1bの嵌め合わせ前にハウジングHの外側に遊嵌せしめ、図2(a)中に破線により示す如く、固定環1bの嵌め合わせに支障を来さない位置に待機させてあり、固定環1bの外嵌を終えた後に軸長方向に移動させて、図2(a)中に実線により示す如く、固定環1bの外側に位置決めされる。
【0024】
この位置決めは、締め付けバンド2の内面に周設された押圧突起2a,2aが、固定環1bの内面における中央の封止突起1cと両側の封止突起1c,1cとの間に夫々位置するように行われるが、高い精度が要求されるものではなく、例えば、固定環1bの外面に適宜に形成された合いマークに締め付けバンド2の周縁を整合させる程度の大まかな位置決めで十分である。なお図においては、固定環1bの外面に締め付けバンド2の締め付け位置を示す凹所を形成し、該凹所の端縁を合いマークとして利用している。
【0025】
ベローズ1の固定は、以上の位置決めを終えた後に締め付けバンド2の拘束を解除して、図2(b)に示す如く実現される。前記拘束の解除により締め付けバンド2は、その内径を減じた締め付け状態になろうとし、内側に整合する固定環1bに締め付け力を加える。このとき、固定環1bの内面に環状をなして突設された封止突起1c,1c,1cがハウジングHの開口縁部の外面との間にて押し潰され、両者間に全周に亘って密な圧着状態が生じて良好なシール性が確保される一方、締め付けバンド2の内面の押圧突起2a,2aが固定環1bの外側を局所的に押圧する結果、該固定環1bの内面は、前記押圧突起2a,2aと整合する部位、即ち、各封止突起1c,1c,1c間の部位においてもハウジングHの開口縁部の外面に強く押し付けられ、ハウジングHに対する固定環1bの軸長方向の位置ずれを防止することができる。
【0026】
以上の如きベローズの取り付け構造によれば、固定環1bの内面に突設された封止突起1c,1c,1cと、締め付けバンド2の内面に突設された押圧突起2a,2aとの作用により、ハウジングHの開口端部へのベローズ1の取り付けが、固定環1bの嵌着部におけるシール性を良好に確保し、また取り付け後における軸長方向の位置ずれを有効に防止しつつ行えるようになる。
【0027】
前記シール性は、締め付けバンド2の締め付けにより固定環1bの内面の封止突起1cを押し潰して得られるものであり、該封止突起1cは、固定環1bの全周に亘って周設された環状の突起であることが必要である。封止突起1cの数は、図示の3本に限らず、1本又は2本であってもよく、また、4本以上であってもよい。封止突起1cの断面形状は、図中に示す半円形に限らず、全周に亘って略一様であれば他の断面形状を採用することができる。また、封止突起1cの周設位置については、締め付けバンド2側の押圧突起2a,2aとの間に前述した整合関係が得られる程度の大まかな精度が要求されるのみである。
【0029】
なお、締め付けバンド2の内面に突設された押圧突起2aは、図1及び図2においては、締め付けバンド2の周壁を内向きに窪ませて形成された台形断面を有する環状の突起として示されているが、押圧突起2aの形成態様はこれに限らず、また固定環 1b の内面の封止突起1cとは異なり、全周に亘る環状の突起である必要はない。
【0030】
図1及び図2に示す押圧突起2aは、締め付けバンド2を得るべく板素材を環状体に成形する工程において同時に形成でき、その後の加工及び仕上げを必要とせずに所定の形状精度、及び位置精度が得られるという効果がある。また、押圧突起2aの数は、図示の2本に限らず、前記封止突起1cの数に合わせて適宜に決定されるものである。
【0031】
【発明の効果】
以上の如く本発明に係るベローズの取り付け構造においては、ベローズの固定環を嵌着対象となるハウジングの開口縁部に外嵌せしめたとき、固定環の内面に周設された封止突起がハウジングの開口縁部の外面に局所的に当接し、その後の締め付けバンドの締め付けにより前記封止突起の相当位置にて全周に亘る密着部が生じてシール性が確保され、同時に締め付けバンドの内面に突設された押圧突起が前記封止突起の非形成部位にて固定環を締め付け、ハウジングの外面との接触面積を増して軸長方向の位置ずれを防ぐから、軸体の突出のためにハウジングの端部に設けた開口へのベローズの取り付けが、高い封止性能を確保しつつ、軸長方向の位置ずれなく可能となる等、本発明は優れた効果を奏する。
【図面の簡単な説明】
【図1】本発明の実施に用いるベローズ及び締め付けバンドの要部拡大断面図である。
【図2】本発明に係るベローズの取り付け構造の実施の形態を示す説明図である。
【図3】シール性の向上を図った従来のベローズの固定環周辺の拡大図である。
【図4】図3に示すベローズの取り付け手順の説明図である。
【符号の説明】
1 ベローズ
1b 固定環
1c 封止突起
2 締め付けバンド
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bellows mounting structure used to hermetically seal an opening provided in a cylindrical housing for projecting a shaft while allowing the shaft to move.
[0002]
[Prior art]
For example, a rack housing extending in the left-right direction of the vehicle body is provided with a rack shaft slidably supported in the axial direction, and protruding ends of the rack shaft on both sides of the rack housing are connected to left and right steering wheels. The rack and pinion type steering device configured to perform steering by sliding the rack shaft in the axial direction, such as a rack and pinion type steering device, performs a predetermined motion including the axial length movement inside the cylindrical housing. There are many devices which are provided with a shaft body, a part of the shaft body is protruded outside from an opening at one or both ends of the housing, and a predetermined work is performed by using the movement of the protruding end. Used in industrial fields.
[0003]
In this type of device, an opening provided at the end of the housing for projecting the shaft is hermetically sealed while allowing the above-described movement of the shaft, so that foreign substances such as water, dust, etc. Sealing means for preventing intrusion into the inside is required, and bellows have been conventionally used as this kind of sealing means.
[0004]
As is well known, a bellows has a peripheral wall that forms a waveform in a cross section including a shaft, and a bellows-shaped main body tube that can expand and contract in the axial direction by deformation of these waveforms, and on both sides of the main body tube. A cylindrical body made of an elastic material having an annular portion (fixed ring) for fixing to a continuously provided object, and when used as the above-described sealing means, an outer surface of an opening edge of the housing; The fixing rings on both sides are externally fitted to and fixed to a part of the shaft body protruding from the opening, respectively, and are mounted so as to be bridged between the housing and the shaft body. With this attachment, the opening is covered with the main body cylinder to achieve sealing, and the movement (mainly movement in the axial length direction) of the shaft body can be allowed by the expansion and contraction of the main body cylinder.
[0005]
When the bellows is attached as described above, it is necessary to ensure that the fixed ring is fitted to the fitting ring and to ensure a high sealing property at the fitting portion. In particular, in the rack-and-pinion type steering device described above, when used as a sealing means between the rack housing and the rack shaft, the mounting position of the bellows may cause muddy water, sand dust, and the like to be flipped up by the wheels while the vehicle is running. It is important to improve the sealing performance at the fitting portion of the fixed ring because it is constantly exposed to foreign matter and may be immersed in water.
[0006]
On the other hand, in the use as a sealing means between the rack housing and the rack shaft, damage caused by the action of an external force during running of the vehicle, such as collision of flying stones flipped by wheels, is prevented, and heat generated in the engine room is prevented. In order to meet these demands, in recent years, resin-made bellows such as polyolefin-based elastomers have been widely used. . However, since the resin bellows is inferior in elasticity to general rubber bellows, it is more important to secure the sealing property at the fitting portion of the fixed ring.
[0007]
Conventionally, the inner diameter of the fixed ring is set by securing a sufficient interference with the outer diameter of the attachment target portion, and the fixed ring is fitted to the target portion in an extended state, while the fitting portion is A mounting structure that tightens the outer side with a tightening band and strongly presses the inner surface of the fixed ring against the outer surface of the target part to improve the adhesion between both sides, thereby improving the sealing performance and preventing the displacement of the fitting position. Is generally adopted.
[0008]
However, when such a mounting structure is adopted, especially in a resin bellows in which a sufficient interference is hardly secured due to lack of elasticity, the sealing performance at the fitting portion of the fixed ring is not sufficient, and Supply and exhaust of the inside and outside air due to expansion and contraction occur via the fitting portion, and there is a problem that foreign substances that enter the housing together with the supply and exhaust cannot be sufficiently prevented.
[0009]
Japanese Patent Application Laid-Open No. Hei 6-313480 proposes to improve the sealing performance at the fitting portion of the fixed ring of the bellows. Figure 3 is an enlarged view of the stationary ring near the bellows disclosed in Japanese Patent Laid-Open No. 6-313480, Fig. 4 is an explanatory view of the installation procedure. As shown in FIG. 3 , the bellows 3 includes a bellows-shaped main body tube 3a in which only one mountain shape of the peripheral wall is shown, and a fixed ring 3b connected to one side of the main body tube 3a. An annular protrusion 3c is provided on the inner surface of the ring 3b, and an annular concave groove 3d is provided on the outer surface of the ring 3b so as to align with the annular protrusion 3c.
[0010]
When the fixed ring 3b is fitted to the opening edge of the housing H to be attached, the bellows 3 provided with such a fixed ring 3b, as shown in FIG. 4 (a), has an annular projection 3c on the inner surface of the fixed ring 3b. Is pushed up by the fitting surface of the housing H, and the corresponding portion on the outer surface rises with the concave groove 3d formed in the portion expanded. And Thus, in a fixed state obtained by tightening the band 4 fastening the outer stationary ring 3b in this state, as shown in FIG. 4 (b), on both sides of the groove 3d is locally pressed, the inner surface The annular protrusion 3c formed at the corresponding portion of the opening is crushed between the outer surface of the opening edge and the outer periphery of the opening edge, and a tight crimping state occurs therebetween, so that a good sealing property is secured over the entire circumference. It is supposed to get.
[0011]
[Problems to be solved by the invention]
However, in the mounting structure as described above, the fastening band 4 to be mounted as shown in FIG. 4 (b) is partially unstable because the raised portions on both sides of the concave groove 3d partially support the flat inner surface. In this case, there is a problem in that the supporting force in the axial direction is insufficient, and the other purpose of preventing displacement in the axial direction cannot be achieved.
[0012]
The concave groove 3d on the outer surface of the fixed ring 3b is provided to absorb the outward bulge caused by the crushing of the annular projection 3c on the inner surface to avoid the above-described inconvenience. If the cross-sectional size of the projection 3c is excessively large, the annular projection 3c is insufficiently crushed to obtain a desired sealing performance, and if it is too small, absorption of the bulge is not sufficient. As a result, the mounting state of the tightening band 4 becomes unstable, and the displacement in the axial length direction is likely to occur.
[0013]
That is, in the bellows mounting structure disclosed in JP-A-6-313480, it is necessary to ensure high shape accuracy in the annular projection 3c and the concave groove 3d in order to achieve a desired purpose. It is difficult to obtain satisfactory shape accuracy by blow molding generally disclosed in the production of this type of bellows, and the above-mentioned inconvenience cannot be solved.
[0014]
The present invention has been made in view of such circumstances, and a bellows used to seal an opening provided for projecting a shaft in a cylindrical housing, while ensuring high sealing performance, It is an object of the present invention to provide a mounting structure that can be mounted without displacement in the axial direction due to the movement of the shaft.
[0015]
[Means for Solving the Problems]
The bellows mounting structure according to the present invention uses a bellows in which fixed rings are continuously provided on both sides of a bellows-shaped main body tube that can expand and contract in the axial direction, and the edge of the end opening of the cylindrical housing. The fixed rings are externally fitted to the outer surface and a part of the shaft protruding from the opening, respectively, and tightened from the outside by a tightening band to allow the movement of the shaft with respect to the housing by expansion and contraction of the main body cylinder. while, in the mounting structure of the bellows for sealing the opening tightly, the fixed one or more sealing projection on the inner surface is circumferentially provided with an annular ring, the outer surface of the fixed ring during the tightening the And a pressing projection protruding from an inner surface of the tightening band so as to press the sealing projection while avoiding a corresponding portion of the sealing projection.
[0016]
In the present invention, when the fixed ring of the bellows is externally fitted to the opening edge of the housing to be fitted, the sealing projection provided on the inner surface of the fixed ring locally contacts the outer surface of the opening edge. When the tightening band is tightened to the outside of the fixed ring, the sealing protrusion is crushed between the sealing ring and the outer surface of the opening edge portion, and a sealed state over the entire circumference is secured. Pressing projections projecting from the inner surface of the band press the fixing ring from the outside, and both sides of the sealing projection are pressed against the outer surface of the opening edge to prevent displacement in the axial direction .
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. FIG. 1 is an enlarged sectional view of a main part of a bellows and a tightening band used for carrying out the present invention. The bellows 1 used in the embodiment of the present invention includes a bellows-shaped main body tube 1a in which only one chevron shape of a peripheral wall is shown, and a fixed ring 1b connected to one side of the main body tube 1a. On the inner surface of the fixed ring 1b, three sealing projections 1c, 1c, 1c each having a semicircular cross-sectional shape are formed in a ring shape at substantially equal intervals in the axial direction.
[0018]
The bellows 1 is made of an elastic material such as resin or rubber, and the diameter of the fixed ring 1b can be increased within an appropriate range by applying an external force. Is used to fix one side of the bellows 1 to the object.
[0019]
The tightening band 2 used in the embodiment of the present invention together with the bellows 1 as described above is a metal ring formed by molding a thin plate made of a material having high elasticity such as spring steel into a ring having a length corresponding to the fixed ring 1b. In the same manner as that conventionally used for the same purpose, by a proper operation from the outer diameter side, a tightened state having an inner diameter sufficiently smaller than the outer diameter of the fixed ring 1b, and It is designed to be able to be restrained in a fitted state having an inner diameter larger than the diameter.
[0020]
As shown in the drawing, a pressing projection 2a is provided on the inner surface of the tightening band 2 so as to project inward. The illustrated pressing projection 2a is formed by indenting the peripheral wall of the fastening band 2 inward, and two annular projections provided on the inner surface of the fixed ring 1b at intervals substantially equal to the sealing projections 1c, 1c, 1c. It is configured as
[0021]
FIG. 2 is an explanatory diagram of a procedure for mounting the bellows 1 using the tightening band 2 as described above. In the figure, reference numeral H denotes a housing to be attached. The bellows 1 is attached to one side of the housing H and fixed to the outer periphery of an opening edge provided for projecting a shaft (not shown), as in the conventional case. The ring 1b is fitted, and the outside of the fixed ring 1b is tightened by the tightening band 2.
[0022]
FIG. 2A shows a state in which the fixed ring 1b is fitted around the outer periphery of the opening edge of the housing H. The sealing projections 1c, 1c, 1c are provided around the inner surface of the stationary ring 1b, and when the stationary ring 1b shown in FIG. 2A is fitted, the sealing projections 1c, 1c, 1c are provided. Are in local contact with the outer peripheral surface of the opening edge.
[0023]
The tightening band 2 is restrained in the above-mentioned fitted state, and is loosely fitted to the outside of the housing H before the fixed ring 1b is fitted. As shown by a broken line in FIG. After the outer periphery of the stationary ring 1b has been fitted, the stationary ring 1b is moved in the axial direction, and is positioned outside the stationary ring 1b as shown by a solid line in FIG. You.
[0024]
This positioning is such that the pressing projections 2a, 2a provided on the inner surface of the tightening band 2 are positioned between the central sealing projection 1c and the sealing projections 1c, 1c on both sides of the inner surface of the fixed ring 1b. However, high accuracy is not required, and, for example, rough positioning such that the periphery of the tightening band 2 is aligned with a matching mark appropriately formed on the outer surface of the fixed ring 1b is sufficient. In the figure, a recess indicating the fastening position of the fastening band 2 is formed on the outer surface of the stationary ring 1b, and the edge of the recess is used as a matching mark.
[0025]
The fixing of the bellows 1 is realized as shown in FIG. 2B by releasing the restraint of the tightening band 2 after the above positioning is completed. When the restraint is released, the tightening band 2 attempts to be in a tightened state in which the inner diameter is reduced, and a tightening force is applied to the fixed ring 1b aligned inward. At this time, the sealing projections 1c, 1c, 1c projecting in an annular shape on the inner surface of the fixed ring 1b are crushed between the outer surfaces of the opening edges of the housing H, and the entire circumference is interposed between them. As a result, the pressing protrusions 2a, 2a on the inner surface of the fastening band 2 locally press the outside of the fixed ring 1b, so that the inner surface of the fixed ring 1b The portion of the fixing ring 1b that is aligned with the pressing projections 2a, 2a, that is, the portion between the sealing projections 1c, 1c, 1c, is strongly pressed against the outer surface of the opening edge of the housing H, and the axial length of the fixed ring 1b with respect to the housing H. It is possible to prevent displacement in the direction.
[0026]
According to the bellows mounting structure as described above, the sealing projections 1c, 1c, 1c projecting from the inner surface of the fixed ring 1b and the pressing projections 2a, 2a projecting from the inner surface of the tightening band 2 act. The bellows 1 can be attached to the opening end of the housing H while ensuring good sealing performance at the fitting portion of the fixed ring 1b and effectively preventing displacement in the axial direction after the attachment. Become.
[0027]
The sealing property is obtained by crushing the sealing projection 1c on the inner surface of the fixed ring 1b by tightening the fastening band 2, and the sealing projection 1c is provided around the entire circumference of the fixed ring 1b. It is necessary that the projection is a circular projection. The number of the sealing projections 1c is not limited to three as shown, but may be one or two, or may be four or more. The cross-sectional shape of the sealing projection 1c is not limited to the semicircular shape shown in the drawing, and other cross-sectional shapes can be adopted as long as they are substantially uniform over the entire circumference. Further, the peripheral position of the sealing projection 1c only needs to be roughly accurate to the extent that the above-described matching relationship can be obtained between the pressing projections 2a and 2a on the tightening band 2 side.
[0029]
The pressing projection 2a protruding from the inner surface of the tightening band 2 is shown in FIGS. 1 and 2 as an annular protrusion having a trapezoidal cross section formed by indenting the peripheral wall of the tightening band 2 inward. However, the mode of forming the pressing projection 2a is not limited to this, and unlike the sealing projection 1c on the inner surface of the fixed ring 1b , the pressing projection 2a does not need to be an annular projection over the entire circumference.
[0030]
The pressing projections 2a shown in FIGS . 1 and 2 can be formed simultaneously in the step of forming the plate material into an annular body to obtain the tightening band 2, and have a predetermined shape accuracy and positional accuracy without subsequent processing and finishing. Is obtained. Further, the number of the pressing projections 2a is not limited to the two shown in the drawing, and is appropriately determined according to the number of the sealing projections 1c.
[0031]
【The invention's effect】
As described above, in the bellows mounting structure according to the present invention, when the fixed ring of the bellows is externally fitted to the opening edge portion of the housing to be fitted, the sealing projection provided on the inner surface of the fixed ring has the housing. Locally abuts the outer surface of the opening edge of the opening , and the subsequent tightening of the tightening band produces a close contact portion over the entire circumference at a substantial position of the sealing protrusion, ensuring the sealing performance, and at the same time, the inner surface of the tightening band. The projecting pressing projections tighten the fixing ring at the portion where the sealing projections are not formed, and increase the contact area with the outer surface of the housing to prevent displacement in the axial direction. The present invention has an excellent effect, for example, in that the bellows can be attached to the opening provided at the end of the shaft without a positional displacement in the axial direction while ensuring high sealing performance.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of a main part of a bellows and a tightening band used for carrying out the present invention.
FIG. 2 is an explanatory view showing an embodiment of a bellows mounting structure according to the present invention.
FIG. 3 is an enlarged view around a fixed ring of a conventional bellows with improved sealing performance.
FIG. 4 is an explanatory diagram of a procedure for attaching the bellows shown in FIG . 3;
[Explanation of symbols]
1 bellows
1b Stationary ring
1c Sealing protrusion 2 Tightening band

Claims (1)

軸長方向への伸縮が可能な蛇腹状の本体筒の両側に固定環を連設してなるベローズを用い、筒形をなすハウジングの端部開口の縁部外面と、該開口から突出する軸体の一部とに前記固定環を夫々外嵌し、締め付けバンドにより外側から締め付けて、前記ハウジングに対する前記軸体の運動を前記本体筒の伸縮により許容しつつ、前記開口を気密に封止するベローズの取り付け構造において、前記固定環の内面に環状をなして周設された一又は複数の封止突起と、前記締め付け時に前記固定環の外面を前記封止突起の対応部位を避けて押圧すべく、前記締め付けバンドの内面に突設された押圧突起とを具備することを特徴とするベローズの取り付け構造。A bellows is used in which fixed rings are connected to both sides of a bellows-shaped main body cylinder that can expand and contract in the axial direction, and an outer peripheral edge of an end opening of a cylindrical housing and a shaft protruding from the opening are used. Each of the fixed rings is externally fitted to a part of the body, and is tightened from the outside by a tightening band to allow the movement of the shaft body with respect to the housing by expansion and contraction of the main body cylinder, and hermetically seal the opening. in the mounting structure of the bellows, avoiding and one or more sealing projections are circumferentially provided at an annular inner surface of the stationary ring, the corresponding portion of the fastening the sealing projection of the outer surface of the stationary ring in pressing And a pressing projection protruding from an inner surface of the tightening band.
JP510296A 1996-01-16 1996-01-16 Bellows mounting structure Expired - Fee Related JP3572470B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP510296A JP3572470B2 (en) 1996-01-16 1996-01-16 Bellows mounting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP510296A JP3572470B2 (en) 1996-01-16 1996-01-16 Bellows mounting structure

Publications (2)

Publication Number Publication Date
JPH09196187A JPH09196187A (en) 1997-07-29
JP3572470B2 true JP3572470B2 (en) 2004-10-06

Family

ID=11602014

Family Applications (1)

Application Number Title Priority Date Filing Date
JP510296A Expired - Fee Related JP3572470B2 (en) 1996-01-16 1996-01-16 Bellows mounting structure

Country Status (1)

Country Link
JP (1) JP3572470B2 (en)

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US11226011B2 (en) 2017-01-11 2022-01-18 Gkn Driveline International Gmbh Bellows comprising at least one internal groove

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DE102004037715A1 (en) * 2004-08-04 2006-02-23 Gkn Driveline International Gmbh Bellow for joint component parts, has joint region arranged between one of folds and ring grooves, and including linear expansion in direction of axis that proceeds via coil regions and parallel to base
FR2909426A1 (en) * 2006-12-04 2008-06-06 Jtekt Europ Soc Par Actions Si Steering boot assembling device for e.g. rack-and-pinion steering gear of motor vehicle, has clamp including boss provided to deform constant thickness zone towards interior, during locking of clamp for axially blocking clamp on gear
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Publication number Priority date Publication date Assignee Title
WO2018130453A1 (en) * 2017-01-11 2018-07-19 Gkn Driveline International Gmbh Bellows with at least two grooves in lobed regions and/or guide regions
US11226011B2 (en) 2017-01-11 2022-01-18 Gkn Driveline International Gmbh Bellows comprising at least one internal groove
US11333244B2 (en) 2017-01-11 2022-05-17 Gkn Driveline International Gmbh Bellows with grooves

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